1. Assume that you have an equation of a plane ax + by + cz = d with c # 0. (a) Determine a parametrization r(u, v) for this plane. (b) Compute Tu X To and |Tu X Ful. (c) We can compute the surface area of this plane over a region D in the xy-plane using s = |Tux Tul dA. Using your answer to (b), explain why the surface area of the plane over D can easily be written in terms of the area of D